Webroot is not catching pop up spams

To answer your question as to why you have to reboot, some files and programs cannot be deleted, stopped, altered, and in many cases moved while still open or possibly running, and Webroot may not have the ability to stop everything associated with the files in question. So they are flagged for deletion on the next startup before they have a chance to load or run.

If you have ever used the task killer, you probably have encountered programs that you cannot kill regardless of your permission level.

Also, you really do not want to wait on every boot-up to scan your entire system to see if something should be killed and deleted. I recall the days of older virus detection programs having to do their full scan early as the machine booted. Problem is, most people just pressed stop and let the machine boot, never getting a full scan because they did not want to wait for it. I find the modern way much more friendly.

But what are you doing that you are "constantly" getting alerts? If you are going to places that may have viruses or malware, you might want to consider a "sand box" program to run the browser when you visit such places. I recommend "Sandboxie", a sand box program that will help keep you safe. You just right click on your browser and say "Run sandboxed". When you exit a sandboxed program, everything generated in the sand box can be deleted, which really helps protect your machine. Sandboxie costs about $21/year, and I find I using it anytime I work a website might not be what it pretends to be, so well worth it. (No, I do not work for them.) And then are other programs that do similar things. This is just an example of what I use.